Oven-temperature regulator.



J. W. SOUTHERN.

OVEN TEMPERATURE REGULATOR.

APPLHIAHON FILED HOV. 30.1917.

Patented July 23, 1918..

v INVENfOR efohn/ WJbmerw.

JOHN WM. SOUTHERN, 0F VANCOUVER, BRITISH COLUMBIA, CANADA.

OVEN-TEMPERATURE REGULATOR.

Specification of Letters Patent.

Patented July 23, 1918.

Application filed November 30, 1911. Serial No. 204,657.

To all whom it may concern:

Be it known that I, JOHN 1V. Sou'rusnN, a citizen of the Dominion ofCanada, residing at Vancouver, in the Province of British Columbia,Canada, have invented certain new and useful Improvements in Oven-Temperatnre Regulators, of which the following is a specification.

This invention relates to an oven tempera.- ture regulator and timealarm cooperative therewith, the object of which is to prevent thetemperature of an oven exceeding: certain predetermined imits, whethermedium, hot or very hot, and for sounding an alarm at any desired numberof minutes after that predetermined temperature has been attained,

The invention is particularly described in the following specification,reference being made to the drawings by which it is accompanied, inwhich:

Figure l is a front elevation and part section of the heat regulator andalarm.

Fig. 2 is a section of the same on the line 2-2 in Fig. 1.

Fig. 3 is a section on the line 33 in ig. 4 is a face view looking inthe direction of the arrow 4 in Fig. l.

Removably secured by a bayonet catch 17 on a ring 2 such as is atpresent used to support an oven thermometer is a chamber 3 of relativelylarger diameter and having a dial plate 4 to the underside of which issecured a thermometer 5 with its indicating pointer ti on the outer faceof the dial.

Separated by a partition 8 from that part of the chamber 3 whichcontains the thermometer is a compartment 7, which is open to theatmosphere through an aperture 9 closable with a slidable shutter 10. A.duct 11 directly connects the space within the oven with that end of thecompartment 7 in which is the closablc aperture 9. The oven end of thisduct has a perforated screen across it and the outer end where itdelivers into the compartment 7 is closable with a hinged valve 13 whichis normally held closed by a l ght spring 12. This valve 13 provides forescape of hot air from the even when the temperature is exceeded'forwhich the device is set.

Control of the escape valve 13 is exercised by the indieatin pointer 6of the thermometer in the fol owing manner. Severally pivoted at 15 onthe inner wall or partition 8 of the chamber 7 at angular distancesapart, is a series of light levers 14. The outer end of each lever 14projects throu h an ap rture 18 in the wall of the cylint er 3, whichaperture is elongated in the plane of the movement of the lever. Eachlever is formed with a portion 16 to project a short distance through anelongated aperture in the dial plate 4. This projecting end 16 isnormally clear of the heat indicating pointer (i but may be projected,when desired, into the path of the pointer, to be engaged and moved byit. Each lever 14 is flexibly connected intermediate of its ends to thefree end of the escape valve 13.

The levers 14 are set at angular distances apart around the dial plateat positions corresponding to thermometer indications representing, avery hot oven and one or the other is brought into the engagingposition, that is, its end 11' is projected outward through the dialplate according as one of these heats is required to be maintained inthe oven.

\Vith this arrangement one of the lovers 1-1 according to thetemperature required. is drawn forward to project its end 16 through thedial plate 4 and into the path of the thermal pointer (i. \Vhrn thedesired temperature is attained in the oven, the pointer 15 indicatingthat temperature will engage the projection 16 of the lever 14 which hasbeen drawn out and will move it to open the valve 13. "lhe hot air fromthe oven is then free to escape through the duct 11 and through therlosable aperture 9.

If this escape of hot air lowers the temperature of the oven below whatis required and for which the lever has been set, that fall oftemperature will cause the thermom eter pointer (3 to reccde fromengagement with the lever projection 16 and the valve 13 will closeunderthe action of its spring and the heat will be retained in the oven.

medium, a,hot, or it" Removably secured on the upper side of the chamber3 with suitable heat insulation to protect it from the heat of the ovenis a clock-work timealal'm (lock 1!), the dial of which is graduated inminutes. The time alarm clock 19 is provided with an alarm 19*. Thisalarm clock is norn'ially main tained stationary when the valve 18 isclosed. It is released when the valve is opened, by a light lever 20pivotally mounted at 21 to some convenient part of the wall of thechamber 3. One end of this lever 20 is connected to the free end of thevalve 13 and the other projects through an opening in the wall of thechamber and the casing of the alarm clock 19 to normally engage and holdagainst movement the balance wheel 22 or other suitable part of theclock mechanism.

When the valve 13 opens in the manner described under an increase oftemperature beyond what it has been set for, the engagemen t of the endof the lever 20 with the clock mechanism is withdrawn, as shown by thedot and dash lines in Fig. 2, and the clock is free to run.

The alarm being set for any desired number of minutes will ring thatnumber of minutes after the predetermined temperature has been attained.

The thermometer control of the oven may be used without the time alarm,if found desirable.

Having now articularly described my invention, I here y declare thatwhat I claim as new and desire to be protected in by Letters Patent, is:

1. An oven temperature time alarm, comprising in combination, a heatindicator exposed to the heat of the oven, a clock adjustable to ring analarm a predetermined time after release of its mechanism, means fornormally holding the clock mechanism against movement, and meansoperative with the heat indicator for releasing the clock mechanism whena predetermined heat is attained whereby the alarm may be given apredetermined time after the desired temperature is attained. I a

2. An oven temperature time alarm, comprising in combination, a heatindicator exposed to the heat of the oven, a clock mechanism adjustableto ring an alarm a predetermined time after release of its mechanism,means for normally holding the clock mechanism against movement, andmeans operative with the heat indicator permitting escape of heated airfrom the oven when a predetermined heat is attained, and means 001operative therewith for releasing the clock mechanism.

3. An oven temperature time alarm, comprismg m COInbIIIat/IOD EL chamberhaving a partition dividing it into two parts, one part of which isexposed to the heat of the oven and the other part open to theatmosphere through a clo'sablc aperture, a heat indicator in thatportion of the clnunber which is ex posed to the oven heat, a duetconnecting the oven to that portion of the chamber which is exposed tothe atmosl'ihcre, a valve nor: mally closin that duet, means operativeby movement 0 the thermal indicator for opening the valve and permittingesca )e of heated air from the oven when a predetermined heat isattained, a clock mechanism adj ustable to ring an alarm at any numberof minutes after rcleasoof its mechanism, means normally arrestingmovement of .the clock mechanism, and means operative by move ment ofthe oven duct valve for releasing the clock mechanism.

4. An oven temperature time alarm, comprising in combination, a chamberhaving a partition dividing it into two parts, one part of which isexposed to the heat of the oven and the other part open to theatmosphere through a closable aperture, a heat indicator in that portionof the chamber which is exposed to the oven heat, the dial of whichindicator extends over that part of the chamher which is open to theatmosphere, a duct connecting the oven to that ortion of the chamberwhich is exposed to t e atmosphere, a valve normally closing that duct,a series of levers pivotally mounted within that portion of the chamberwhich is exposed to the atmosphere, said levers projecting throughapertures in the outer wall of the chamber and having portionsprojecting through the dial of the heat indicator at angular distaneesapart corresponding to various temperatures, provision permitting saidlovers to be normally retained clear of the heat indicator pointer, andmeans for releasing said levers to project that portion which rejectsthrough the dial into the path of t e heat indicator, flexible meansconnecting each lever with the oven duct controlling valve, a clockmechanism adjustable to ring an alarm at any definite time after releaseof its mechanism, means restraining movement of the clock mechanism, andmeans operated by the oven duct valve for releasing the clock mechanism.

5. An oven temperature regulator comprising a chamber, a valved ductadapted for communication with the oven, a valve for said duct, a springfor closing said valve, a thermostat having a movable element andlocated in cooperative relation to said chamber, a valve 0 ening leverconnected with said valve and means whereby said lever may be engaged bysaid movab e element at a redetermined temperature to open said va veuntil the temperature falls again.

lot

6. An ovbn tompemture regulator comprising a rhmnlwr, :1 mivcd ductadapted for cmunmmcnhon \vlth the men a valve for mid (Inst :4 springforclosing said valve, :1 thm'lmmlnt Ming :1 movable clemvni' and lm'allmlin cor'ipm'ui in: nlution [0 said 0111mlmi'. .1 valve (musing loverconnected with ma \wxlnmeans whereby said lever may be engaged by saidmovable element at a predetermined temperature to open said valve untilthe temperature falls again, and an alarm dovicv, means cofiipemtmg withtha ain: for holding said alarm deuce inactive when said aim: is closedand adapted to release maid \hwive when the valve is open.

111 iwtimouy hu-001' I affix my signature,

J OIIN WM. SOUTHERN.

